3638470491 has 12 divisors (see below), whose sum is σ = 5265011232. Its totient is φ = 2421288816.

The previous prime is 3638470483. The next prime is 3638470501. The reversal of 3638470491 is 1940748363.

3638470491 is a `hidden beast` number, since 3 + 638 + 4 + 7 + 0 + 4 + 9 + 1 = 666.

It is not a de Polignac number, because 3638470491 - 2³ = 3638470483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3638470091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 357891 + ... + 367916.

It is an arithmetic number, because the mean of its divisors is an integer number (438750936).

Almost surely, 2^3638470491 is an apocalyptic number.

3638470491 is a deficient number, since it is larger than the sum of its proper divisors (1626540741).

3638470491 is a wasteful number, since it uses less digits than its factorization.

3638470491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726370 (or 726367 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 3638470491 is about 60319.7355017411. The cubic root of 3638470491 is about 1538.0588477288.

The spelling of 3638470491 in words is "three billion, six hundred thirty-eight million, four hundred seventy thousand, four hundred ninety-one".